Ferro-titanium alloying method for titaniferous stainless steel

A titanium-iron alloy and stainless steel technology is applied in the field of titanium-iron alloying of titanium-containing stainless steel. rate effect

Active Publication Date: 2013-08-28
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] After the stainless steel production line of the applicant's second steelmaking plant was put into production in September 2006, the output of titanium-containing stainless steel 321, 316Ti, 409L and other steels increased, and titanium alloying was carried out by feeding titanium wires in the LF furnace. A large amount of water needs to be fed with more titanium wires, which takes a long time and seriously affects the normal production order. Using ferro-titanium for direct alloying, the purity of molten steel is not good, resulting in blockage of the nozzle of the continuous casting mold and crusting of mold slag and other issues that affect production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The steel type smelted in this embodiment is 321 (0Cr18Ni10Ti), the capacity of the LF refining furnace is 180 tons, and the molten steel is processed 175 tons. There are two bottom blowpipes. The thickness of the slag after the molten steel reaches the LF refining furnace is 50mm. This steel is in the national standard. The mass percentage ratio of the ingredients is:

[0020] C≤0.08; Si≤1.00; Mn≤2.00; Cr 17.00-19.00;

[0021] Ni 9.00-12.00; Ti≥5C; P≤0.035; S≤0.030.

[0022] The applicant controlled the mass percentage ratio of the steel composition to:

[0023] C≤0.04; Si 0.40-0.70; Mn 0.80-1.50; Cr 17.00-18.00;

[0024] Ni 9.00-9.50; Ti 5C-0.25; P≤0.035; S≤0.010.

[0025] The rest is Fe and unavoidable impurities.

[0026] The embodiment of this titanium-containing stainless steel titanium-iron alloying method is the following sequential steps:

[0027] I slag off

[0028] After AOD tapping, remove the slag in the ladle at 01:00:00, and the thickness of the remaining slag is 50mm...

Embodiment 2

[0042] The steel type smelted in this embodiment is 316Ti, the capacity of the LF refining furnace is 180 tons, the molten steel is processed 179 tons, there are two bottom blowpipes, the slag thickness after the molten steel reaches the LF refining furnace is 50mm, and the composition of this steel in the ASTM standard The mass distribution ratio is:

[0043] C≤0.08; Si≤0.75; Mn≤2.00; Cr 16.50-18.50;

[0044] Ni 10.50-13.50; Ti≥5×C+N)-0.70; P≤0.045; S≤0.015.

[0045] The applicant controlled the mass percentage ratio of the steel composition to:

[0046] C≤0.04; Si 0.30-0.70; Mn 0.80-1.50; Cr 16.50-17.00;

[0047] Ni 10.50-11.00; Ti 5×C+N); P≤0.045 S≤0.010 N≤0.020

[0048] The rest is Fe and unavoidable impurities.

[0049] The embodiment of this titanium-containing stainless steel titanium-iron alloying method is the following sequential steps:

[0050] I slag off

[0051] After AOD tapping, remove the slag in the ladle at 03:20:00, and the thickness of the remaining slag is 50mm;

[0052...

Embodiment 3

[0065] The steel type smelted in this embodiment is 409L, the capacity of the LF refining furnace is 180 tons, the molten steel processing is 170.2 tons, there are two bottom blowpipes, the slag thickness after the molten steel reaches the LF refining furnace is 50mm, and the composition of the steel in the JIS standard The mass distribution ratio is:

[0066] C≤0.03; Si≤1.00; Mn≤1.00; Cr 10.50-11.75; Ni≤0.60

[0067] Ti≥6C-0.75; P≤0.035 S≤0.030; N≤0.030.

[0068] The applicant controlled the mass percentage ratio of the steel composition to:

[0069] C≤0.012; Si≤0.75; Mn≤0.80; Cr 11.00-11.75;

[0070] Ni≤0.30; Ti 10×C-0.15; P≤0.035 S≤0.010 N≤0.020

[0071] Nb 0.15-0.20;

[0072] The rest is Fe and unavoidable impurities.

[0073] The embodiment of this titanium-containing stainless steel titanium-iron alloying method is the following sequential steps:

[0074] I slag off

[0075] After AOD tapping, remove the slag in the ladle at 20:20:00, and the thickness of the remaining slag is 50mm;

...

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Abstract

The invention relates to a ferro-titanium alloying method for titaniferous stainless steel, which comprises the following steps of: I) after slagging off and AOD (Argon Oxygen Decarburization) tapping, removing slag and keeping the thickness of the remained slag being not more than 50mm; II) making a slag steel bag again and hanging in an LF (Low Frequency) finery, adding lime and fluorite for making the slag again, blowing argon from bottom and powerfully stirring and slagging or electrifying and slagging; III) deoxidizing, adding aluminum powder in surface slag, keeping total bottom blowingflow being 600-1,000Nl / min, and stirring for 3-5min; IV) before discharging molten steel, starting to feed a silico-calcium line, and then softly stirring; and V) adding ferro-titanium for alloying, keeping the bottom blowing argon flow close to the side of a feeding port being 500-700 Nl / min and the one away from the side of the feeding port being 100-200Nl / min, adding 2.5-3.5kg ferro-titanium in a ton of molten steel, keeping the bottom blowing flow being 200-300 Nl / min per piece and stirring, and then adjusting the total flow of bottom blowing double-tube being not more than 200NL / min, andsoftly stirring. According to the ferro-titanium alloying method for titaniferous stainless steel, the titanium-feeding time is short and a crystallizer water port is prevented from being plugged during a continuous casting process.

Description

Technical field [0001] The invention relates to a method for alloying titanium-containing stainless steel with titanium and iron. Background technique [0002] After the applicant’s second steelmaking plant was put into operation in September 2006, the output of titanium-containing stainless steels such as 321, 316Ti, and 409L increased. Titanium alloying was carried out by feeding titanium wires in the LF furnace. A large amount of water needs to be fed with more titanium wires, which take a long time, which seriously affects the normal production order. The direct alloying with titanium iron will result in poor purity of the molten steel, causing the continuous casting mold nozzle to block and mold protective slag to crust. And other issues, affecting production. Summary of the invention [0003] In order to overcome the above-mentioned shortcomings of the existing titanium-containing stainless steel titanium-iron alloying method, the present invention provides a titanium-conta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/06C22C38/50C21C7/00
Inventor 常国栋李建民陈景锋刘卫东
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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